[ADF-1434] Theming ADF component (#2228)

* start custom theming adf

* demo shell cleaning

* login mdl cleaning

* uploader mdl cleaning

* prebuilt themes

* theme picker in demo shell

* clean custom colors and mdl

* fix rebase errors

* theming from color style guide

* dev default theme orange purple

* fix color accent inverted in picker

* fix test and add colors classes

* fix tag component theming issues

* fix datatable theming

* add theming guides

ng2-components/config/webpack.style.js

@@ -0,0 +1,40 @@
+const ExtractTextPlugin = require("extract-text-webpack-plugin");
+const path = require('path');
+
+const extractScss = new ExtractTextPlugin('./ng2-alfresco-core/prebuilt-themes/[name].css');
+
+module.exports = {
+
+    entry: {
+        'adf-blue-orange': './ng2-alfresco-core/styles/prebuilt/adf-blue-orange.scss',
+        'adf-blue-purple': './ng2-alfresco-core/styles/prebuilt/adf-blue-purple.scss',
+        'adf-cyan-orange': './ng2-alfresco-core/styles/prebuilt/adf-cyan-orange.scss',
+        'adf-cyan-purple': './ng2-alfresco-core/styles/prebuilt/adf-cyan-purple.scss',
+        'adf-green-purple': './ng2-alfresco-core/styles/prebuilt/adf-green-purple.scss',
+        'adf-green-orange': './ng2-alfresco-core/styles/prebuilt/adf-green-orange.scss',
+        'adf-pink-bluegrey': './ng2-alfresco-core/styles/prebuilt/adf-pink-bluegrey.scss',
+        'adf-indigo-pink': './ng2-alfresco-core/styles/prebuilt/adf-indigo-pink.scss',
+        'adf-purple-green': './ng2-alfresco-core/styles/prebuilt/adf-purple-green.scss'
+    },
+
+    output: {
+        filename: './dist/[name].js'
+    },
+
+    module: {
+        rules: [{
+            test: /\.scss$/,
+            use: extractScss.extract([{
+                loader: "raw-loader"
+            }, {
+                loader: "sass-loader",
+                options: {
+                    includePaths: [path.resolve(__dirname, '../../ng2-components/ng2-alfresco-core/styles')]
+                }
+            }])
+        }]
+    },
+    plugins: [
+        extractScss
+    ]
+};